As I've already planned to line the sides of my 30 gallon Critter Cage with foam board insulation (painted black), I was thinking about whether to just stick with heavy duty foil on the screen, like I have on my 20 gallon now or try something different.

Since the 30 gallon is a bit longer and wider than the 20, I am contemplating whether or not to use both the CHE I have on the cool end, and maybe the infrared heat bulb in the middle (intermittently as needed).

I welcome feedback and suggestions.